/*
 * BatchFileTokenMarker.java - Batch file token marker
 * Copyright (C) 1998, 1999 Slava Pestov
 *
 * You may use and modify this package for any purpose. Redistribution is
 * permitted, in both source and binary form, provided that this notice
 * remains intact in all source distributions of this package.
 */

package org.syntax.jedit.tokenmarker;

import javax.swing.text.Segment;

import org.syntax.jedit.SyntaxUtilities;

/**
 * Batch file token marker.
 * 
 * @author Slava Pestov
 * @version $Id: BatchFileTokenMarker.java,v 1.20 1999/12/13 03:40:29 sp Exp $
 */
public class BatchFileTokenMarker extends TokenMarker
{
    public byte markTokensImpl(byte token, Segment line, int lineIndex)
    {
        char[] array = line.array;
        int offset = line.offset;
        int lastOffset = offset;
        int length = line.count + offset;

        if (SyntaxUtilities.regionMatches(true, line, offset, "rem"))
        {
            addToken(line.count, Token.COMMENT1);
            return Token.NULL;
        }

        loop: for (int i = offset; i < length; i++)
        {
            int i1 = (i + 1);

            switch (token)
            {
            case Token.NULL:
                switch (array[i])
                {
                case '%':
                    addToken(i - lastOffset, token);
                    lastOffset = i;
                    if (length - i <= 3 || array[i + 2] == ' ')
                    {
                        addToken(2, Token.KEYWORD2);
                        i += 2;
                        lastOffset = i;
                    }
                    else
                        token = Token.KEYWORD2;
                    break;
                case '"':
                    addToken(i - lastOffset, token);
                    token = Token.LITERAL1;
                    lastOffset = i;
                    break;
                case ':':
                    if (i == offset)
                    {
                        addToken(line.count, Token.LABEL);
                        lastOffset = length;
                        break loop;
                    }
                    break;
                case ' ':
                    if (lastOffset == offset)
                    {
                        addToken(i - lastOffset, Token.KEYWORD1);
                        lastOffset = i;
                    }
                    break;
                }
                break;
            case Token.KEYWORD2:
                if (array[i] == '%')
                {
                    addToken(i1 - lastOffset, token);
                    token = Token.NULL;
                    lastOffset = i1;
                }
                break;
            case Token.LITERAL1:
                if (array[i] == '"')
                {
                    addToken(i1 - lastOffset, token);
                    token = Token.NULL;
                    lastOffset = i1;
                }
                break;
            default:
                throw new InternalError("Invalid state: " + token);
            }
        }

        if (lastOffset != length)
        {
            if (token != Token.NULL)
                token = Token.INVALID;
            else if (lastOffset == offset)
                token = Token.KEYWORD1;
            addToken(length - lastOffset, token);
        }
        return Token.NULL;
    }

    public boolean supportsMultilineTokens()
    {
        return false;
    }
}
